Improvement in molding-machines



Ldatiert tatra @met (dimite.

JAMES H. CULVER, OF SAN FRANCISCO, CALIFORNIA.

Letters Patent No. 112,691; dated March 14, 1 871 .IMPROVEMENT IN MQLDlNG-MACHINE'S'.

The Schedule referred to in these Letters Patent and making part of the same.

Be it known that I, J AMES H. GULVER, of the city and county of Sany Francisco and State of. California,

have invented certain Improvements in Twist or Spirall and their arms.

Figure 'shows the principle lupon which the edge.

of the cutters should be applied to the timber.

Similar letters indicate the saine parts in all the figures.

The body of the machine consists of the annular rim A, supported by the frame B. Upon this rim is -placed the flanched circular table C, like a cover, so

fitted as to revolve horizontally, carrying ou its ilanch set-screws I), which itinto a groove. in the rim and fix the table in anydesired position.

kind.

The shaft F is journaled upon the frame H, which slides vertically in guides, not shown, and adjustable by the hand-wheel I.

Upon the table CA are arranged the two parallel guide-pieces J J, made adjustable to and from each other by the arms K K sliding in dovetailed grooves in the table, and held in place by the set-screws L L working through slots in the .arms and into the table, as shown. Y

M is a thin sharp blade set into nut N, andis adjustable horizontally bya screw shown in the lever 0, which lever is pivoted to the post P at one end, while the other end slides vertically in the forked post P', and is held down by the weight Q sliding upon it.

This arrangement of the blade I call the primary feeder, and it is situated on that sideof the cutters to and produce the thread or threads of the twist pree" cisely as the edges of common cutters are formed to apply to and produce the members of straight mold- 'lhe cutter-head E and pulley G are of the ordinary ings; that is to say, in my machine the thread ofthe twist is presented .to the cutters in such a manner that .the cutters move` lengthwise of the thread at the poi'nt where the cutting is going on, exactly as they do lengthwise of the members in straight moldings; and as the cutters are made with reference to the crosssection of the members'of straight moldings, so they vare made in minewith reference to the cross-,section of the thread.

The outer and dat side of the cutters should incline as little as possible to =tll1e line of motion; for this reason Ilmake the cutters as shown at'R in the drawings, forming the required bends, curves, and angles mainly in the plate of theblade itself, instead of mainly injits edge, as in ordinary cutters. Across the face of the table C, in the line of the guides J-J, isa V-groove, in which lies the timber to.

-be worked.

To the edge of the table, at the feed end of this groove, is attached the support S,'through which is a hole large enough to admit the largest timber to beworked.

l0n theouter face of this support moves vertically the slide T, carrying the hub U and .grooved pulley V, which is revolved on its own axis by adriving-cord,

and-is held in place by a danch running in the slide T, as shown.

l To' the outer face of this hub and pulley are .attached the two concave rollers W, made adjustable 'to ,andl

fromA each other by screws X working on their journals. Through or by these means rotation is given vto the blank' cylinder.

It is frequently desirable to leave-spaces of greaterl o'r lesser width between the threads of -the spiral, and to have them broken by a succession of cavities, Sto.

This is accomplished by what I term the carving'attachment, N', as follows:

On the discharge-side of the table, near the secondary feeder, the carver, consisting of the spindle Y, ruuning on its own axis directly above the lV-g'roovein the table, in arms. attached to a supporting-postee@ haekfar enough to avoid the molding as it passes, and the lower end N for any device to be attached. It is revolved horizontally by a belt or cord, in any of the ordinary modes, and is controlled vertically by the forkedcrank-arm Z on the shaft a, which turns in the boxes-b set on posts of the proper' heightabove the table toallow thel arm Z to be horizontal and clear the molding.'

To the other end of the shaft a is the corresponding arm c, which rests on the cam d revolvedv by the pulley V.

The cam d and the cutter on the carver will determine the character of l the carving. TheV carver is made adjustable in the line of the timber, so as to apply to any desired part of the thread or spacesof the molding. This may be done by uniting Z and a by a, forked joint, and applying4 a'slot and setescrew to the -duced between the rollers YV, which are so adjust-A ed to it as to allow it tolle in the V-groove'across the table, and to clasp `it with snicient force to turn it, not-withstanding the resistanceof the feed-blades and roilers. The pulley V, being rotated, carries with lil;

the feed-rollers and the cylinder; this, gives the de sred rotation to the cylinder -on its own axis, and at .the same time allowsit tc pass longitudinally between the rollers, with but slight resistance.l The primary feed-blade is then adjusted so that, when the cylinder is turned beneath it, the edge of the knife will mark upon it the track of the desired twist or spiral.

As the cutters will indicate the exact distance from threadv to thread, theI marks of the feed-blade must be the same distance apart. By one or' two trials or measurements the adjustment will be perfected.

The table is now to be turned till the line of motion of the cutters corresponds with the line of` the thread at the point of their contact, and fastened by the thumb-screws D. i y

It will be noticed that, by causing the line of the cutter-shaft andthat of.the cylinder' to cross each other diagonally one way, a yright-hand screw or spiral `will- Wwill present its surface tothe cutters in the exact line vary feeder and the entire cylinder worked through.

I scarcely need mention-that more than one thread can-he cut` as well as a single one by forming thecutters forthat purpose. A

It' the spaces between threads, or the threads themselves, are required to be broken, it can be done by the carving attachment as. follows The Carver, being made in any desired forni,) being adjusted by the means already described to cutthe proper deptlrand in the proper-line, the lever c is dropped upon the cam (l, made in sueh'form as to give the desired form to the carving by raising and lowering tbe carver.

The earver can be allowed to cut a continuous.

groove if desired, and this groove may be wavy or zigag, by giving the proper lateral motion tothe carver- A .great 'variety of tigures, lines, and other ornament-ations in imitation of carving can be thus done by any operator having any degree of skill beyond that of a boy. l

It will also occur to any good operator that curved ,moldings may he cutby making some simple lnodications in the feed, and also that themachne can be made with the cutters above the timberv instead of below. i

Having thus described my invention,

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination of the rotating rollers W W and eeders Mand M', as and for the purposes herein set orth.'

2. The spindle Y, with the carving attachment N, in combination with the rollers W W and Ifeeders M and M,as and for the purposes herein recited.

' .Wtnesses: J AMESYH. GULVER.

' ALFRED Rrx, l

J AMES Davon. 

